The introduction of modern water carriage system transferred the sewage disposal from the strrets and the surrounding of townships to neighbouring streams and rivers. This initiated the problem of water pollution. With rapid urbanization and industrialization the problem of the pollution of natural waters is reaching alarming proportion.
The problem is more complicated where distribution of water is more uneven and fluctuating. Under such conditions, polluted waters are not sufficiently diluted. As a result the river waters do not get natuarally purified.
With expanding industries, the waste waters are discharged in neighbouring streams and they become progressively unsuitable as sources of potable water. Fish life may be ruined. The problems are becoming increasingly serious with higher degree of industrialization and higher standards of living.
All liquids wastes find there way to inland or coastal waters; hence pollution may be diminished be treatement of sewage and industrial wastes. It is depends on following factors.
a) Characteristics of sewage and waste water and their effects on probable use of the receiving streams.
b) The quantity of waste water.
c) Proximity of downstream municipalties, village communities and industries.
d) Possible harmful effects of waste water on the structure of sewage system.
Benefits of control-
The benefits which result from prevention of water pollution include a general improvement in the standard of health of population, the possibility of restoring stream waters to original beneficial state and rendering them fit as source of water supply and maintainance of clean and healthy surroundings.
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